https://github.com/mdgriffith/elm-animation-pack

Easily manage your animation states in Elm!
https://github.com/mdgriffith/elm-animation-pack

animation elm elm-style-animation

Last synced: about 1 month ago
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Easily manage your animation states in Elm!

• Host: GitHub
• URL: https://github.com/mdgriffith/elm-animation-pack
• Owner: mdgriffith
• License: bsd-3-clause
• Created: 2017-02-27T18:28:38.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-02-28T13:51:20.000Z (over 7 years ago)
• Last Synced: 2024-05-08T23:25:39.948Z (6 months ago)
• Topics: animation, elm, elm-style-animation
• Language: Elm
• Size: 75.2 KB
• Stars: 6
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Manage your Elm animation states!

Managing your animation states in Elm can be a pain.  This module is an attempt at making it a little bit easier.

Essentially this module uses a dict behind the scenes to keep track of your animation states.  This comes with some tradeoffs, check the __warnings__ section at the bottom of the doc.

## Code Example

Initial model and subscription.

```elm

import Color

import Animation

import Animation.Pack

type MyStyles 

    = MyStyle 

    | OtherStyle

-- Fancy alias for the tuple comma

(=>) = (,)

-- Your initial model.

init =

    { styles = 

        Animation.Pack.init

            [ MyStyle =>

                [ Animation.opacity 0.0

                , Animation.color Color.blue

                , Animation.left (px 0.0)

                ]

            , OtherStyle =>

                [ Animation.opacity 0.0

                , Animation.color Color.blue

                , Animation.left (px 0.0)

                ]

            ]

    }

-- .. add the subscription to your subs

   , subscriptions = (\model -> Animation.Pack.subscription Animate model.styles)

-- .. Add an animation update command to your update function.

    Animate animMsg ->

        let

            (newStyles, cmds) = Animation.Pack.update animMsg model.styles

        in

            ( { model | styles = newStyles}

            , cmds

            )

```

#### Now you can animate!

```elm

    StartAnimation ->

        let

            newStyles =

                model.styles

                    |> Animation.Pack.animate MyStyle

                        [ Animation.to

                            [ Animation.left (px 0.0)

                            , Animation.opacity 1.0

                            ]

                        ]

                    |> Animation.Pack.animate OtherStyle

                        [ Animation.to

                            [ Animation.color Color.red

                            , Animation.top (px 80)

                            ]

                        ]

                }

        in

            ( { model | styles = newStyles }

            , Cmd.none

            )

```

## More Advanced Usage

You can dynamically add an `Animation.State` to your pack by using `Animation.Pack.add`.  This is useful when you need to start animating something you didn't have when the app started!

## Warnings

Because this module is using a dict behind the scenes, you lose some of the strengths of elm's type checking.

Here are all the pitfalls you need to be aware of:

  * If you try to update/animate a state that doesn't exist, you'll get a logged warning (i.e. runtime notification) and _nothing else will happen_!

  * Be careful about using `Animation.Pack.add` all the time.  Use it only when you're _sure_ you need it.  Remember to `Animation.Pack.remove` any states you're not using.

  * Don't use functions as keys for `Animation.Pack`.  If you do, you'll have a bad time.